The NBA has made two major rule changes ahead of the 2019-20 campaign, one of which is the use of in-game challenge flags similar to that of the NFL.

Unfortunately, NBA head coaches won't simply be tossing red challenge flags on the court, which would certainly be a sight to see. Instead, coaches will simply signal to the referees that they would like to challenge the call on the court.

Per the NBA's official release (via Tim Reynolds of The Associated Press):

“The first change is the introduction of a Coach's Challenge to trigger instant replay review of a limited set of matters. A version of the Coach's Challenge has been in effect in the NBA G League for the last two seasons and is being used at MGM Resorts NBA Summer League 2019 will be adopted in the NBA on a one-year trial basis during the 2019-20 season.

It remains to be seen how this rule change will affect the game flow and strategies of coaches. However, this is certainly a rule that could benefit teams if used properly.

Moreover, the rule change should also help decrease complaints on NBA refereeing, as the league now somewhat empowers teams to protest a controversial call — something that was prevalent in the past few seasons.